Justice Minister Mitsuhide Iwaki is feeling threatened.
With his electoral district in Fukushima Prefecture reduced to one seat from two for Sunday's Upper House election, he needs to beat Democratic Party rival Teruhiko Mashiko, something he failed to pull off the last time around.
If the Cabinet minister loses, it will end his career and deal a humiliating blow to the administration of Prime Minister Shinzo Abe. And with Mashiko enjoying joint backing from opposition parties including the DP, the Fukushima race represents a showdown between the Liberal Democratic Party-Komeito ruling bloc and the opposition.